sql: issue GetRequests from SQL when possible

pkg/ccl/logictestccl/testdata/logic_test/multi_region

@@ -1474,7 +1474,7 @@ vectorized: true
               table: orders@primary
               spans: [/'ap-southeast-2'/'94e4b847-8f2f-4ac5-83f1-641d6e3df727' - /'ap-southeast-2'/'94e4b847-8f2f-4ac5-83f1-641d6e3df727'] [/'us-east-1'/'94e4b847-8f2f-4ac5-83f1-641d6e3df727' - /'us-east-1'/'94e4b847-8f2f-4ac5-83f1-641d6e3df727']
 ·
-Diagram: https://cockroachdb.github.io/distsqlplan/decode.html#eJykk9tO20AQhu_7FKPhgoM2cnyABEtIRm1Kg9KEJlSt1I2Q8U5g22TX3V2rrlCu-mx9r8o2FIIaBOmFrT3MNzP_P_YN2u9zjLH3-Wxw3B_Czpv-5HzyYbALk96g9_octBFkLqRgkBu90LcrmREcT5rFxQ_prnXhLuqAu9s9ENJmulBuNbCJgrfj0fsmt4XTUX_YZLfwcdIfnsDOXa1d-PSuN-797QKOYPswouiyG3Va3Vkwa0Vptt_qhjO_dRD54oBCMesEnW1kqLSgYbogi_EXjHDKMDc6I2u1qY5u6oC-KDFuM5QqL1x1PGWYaUMY36CTbk4Y43l6OacxpYKM10aGglwq53XaRkGSG7lIzU9kOMlTZWPwOCYcPY6cl4cR5yVVr8vuCedld-ad_v7FeTnzBeelL9RRtelsc2xtyHlbkCoBPmh3TQYZjgoXQ-KzJGBJiNMlQ124e4XWpVeEsb9km7ngP9uFqu_2hk5synpbz3YgWOvAvfBC1fpIrIieLv_h0VC3dO4Fq-4M5EI68Nf20H7JFE61VLdDCFfLND_QgyEMtP5W5PBVSwVaxZBUwJiUIFM7A0nIIAmqZy_ZX9te-JL2xmRzrSw9smqd8ClDElfU-G11YTI6MzqryzTbUc3VB4Ksa26DZtNX9VX9FT-E_f-BgyfhcAVuP4bDJ-HoETxdvvoTAAD__499yik=
+Diagram: https://cockroachdb.github.io/distsqlplan/decode.html#eJykUttO20AQfe9XjOaFizZKfIEES0hGbUqD0oQmVK3UtZDxjmHbZNfdXauuUJ76bf2vyjYUghoE9MHWzuXMnHM012i_LzDC4efT8dFoAttvRvOz-YfxDsyH4-HrM9BGkDmXgkFh9FLfvGRGcDRvH-c_pLvSpTtvGm6ruyCkzXSp3Hpj2wVvZ9P37WwLJ9PRpJ1u4eN8NDmG7dtdO_Dp3XA2_MsCDmHrIKTwYhD2O4Pczzthmu11BkHudfZDT-xTIPK-399ChkoLmqRLshh9wRAThoXRGVmrTZ26bhpGosKox1CqonR1OmGYaUMYXaOTbkEY4Vl6saAZpYJMt4cMBblULpqxrYK4MHKZmp_IcF6kykbQ5Rhz7HLkvDoIOa-o_l0MjjmvBnn35PcvzqvcE5xXnlCHddDf4tjtQaoEeKDdFRlkOC1dBLHHYp_FASYrhrp0d0ytSy8JI2_FXqbGe7KamnfvRYqerMLfqOKOfKkajiTWiCerf-ic6I4uuv66wrFcSgfeRg695zh5oqW6MTJYX9Me8z0jx1p_Kwv4qqUCrSKIa8CMlCDTOANxwCD262833ttIL3gOvRnZQitLD6zaJDxhSOKSWr-tLk1Gp0ZnzZo2nDa4JiHIurbqt8FINaXmEu-Dvf8B-4-CgzVw7yE4eBQcPgAnq1d_AgAA__8yFKQ7
 
 query T nodeidx=3
 USE multi_region_test_db; EXPLAIN (DISTSQL) SELECT
@@ -1511,7 +1511,7 @@ vectorized: true
                   table: orders@primary
                   spans: [/'ap-southeast-2'/'94e4b847-8f2f-4ac5-83f1-641d6e3df727' - /'ap-southeast-2'/'94e4b847-8f2f-4ac5-83f1-641d6e3df727'] [/'us-east-1'/'94e4b847-8f2f-4ac5-83f1-641d6e3df727' - /'us-east-1'/'94e4b847-8f2f-4ac5-83f1-641d6e3df727']
 ·
-Diagram: https://cockroachdb.github.io/distsqlplan/decode.html#eJykk19v2jwUxu_fT2GdXvRdZZq_BRqpkquNbVQMOqi0STNCaXzSegM7c5wtU8XVPtu-15SEtgMN1LILSHx8fjnPeexzB_nXOUTQ-3g5OO8Pyf-v-pOryfvBCzLpDXovr4g2As1MCkoyoxc6P64fq4BMkJxPmpfZd2lvdWFndcL97hERMk90oex6YpNFXo9H75oSObkY9YerImR0_3YsVaoJ44XrBrjKbGIf3vbGvQd55IwcnoYYXnfDTqub-mkrjJOTVjdIvVY79EQbA5F2_M4hUFBa4DBeYA7RJwhhSiEzOsE816YK3dUJfVFC5FKQKitsFZ5SSLRBiO7ASjtHiOAqvp7jGGOBxnGBgkAby3n92UYpy4xcxOYHUJhkscoj4nBgHBwOnJenIeclVn_X3Tecl93Uufj1k_My9QTnpSfUWbXoHHJo7ck5ByRWgnhE21s0QGFU2IgwjzKfshCmSwq6sI8d5ja-QYi8Jd3PBe_JLlS63T2d2Jd1Dp7sgL_VgcfGC1X3h2Kt6enyLx4NdUtnjr_uzkAupCXeVg3uc06hr76hsSgutFRonGC9VDNMrHnMqvmZSVECfcB6ZWYIaz9MGgs2rAp2uRU8R2mlcHVdwi0q76_LQOsvRUY-a6mIVhFhFTAaEtZZFzpGJdDUWgk7oYT51e-ItbcqDp-jeIx5plWOG-e87dSmFFDcYHNZcl2YBC-NTuoyzXJUc3VAYG6bXb9Z9FW9VY_gn7D3L7C_Ew7WYHcTDnbC4W443AmfbMDT5X-_AwAA___uBSO6
+Diagram: https://cockroachdb.github.io/distsqlplan/decode.html#eJykk99uGjsQxu_PU1hzk9PIhP0XICtFctTSlohCCpFaqUZos55N3IK9tb3tVhFXfba-V7W7JCmooCS9ANvj-Zjf5xluwX5dQAz9jxfDs8GI_P9qML2cvh--INP-sP_ykmgj0MyloCQ3eqntUb2sAzJFcjZtNvPv0t3ows3rhLvbQyKkTXWh3GZik0VeT8bvmhKWnI8Ho3URMr7bHUmVacJ44XkhrjOb2Ie3_Un_Ho-ckoOTCKOrXtRt9bIga0VJetzqhZnf6kS-6GAosm7QPQAKSgscJUu0EH-CCGYUcqNTtFabKnRbJwxECbFHQaq8cFV4RiHVBiG-BSfdAiGGy-RqgRNMBJq2BxQEukQu6p9tSFlu5DIxP4DCNE-UjUmbA-PQ5sB5eRJxXmL1ddV7w3nZy9rnv35yXma-4Lz0hTqtDt0DDm2PJEoQn2h3gwYojAsXE-ZTFlAWwWxFQRfugdS65Boh9lf0eW78R7upuL1nOXq0i2Cniwf4QtWMKDbAZ6u_-Bzpls7bwabDoVxKR_ydDN5TXnKgvqFxKM61VGja4WapZrBZs8yrWZ5LUQK9l_XL3BDWuZ96Fm49VbjvtcKnkFaE65ZHOyjvWj7U-kuRk89aKqJVTFglGI8I626CTlAJNDUrYceUsKD6HLLOTuLoKcQTtLlWFrf6vKtrMwoorrEZFqsLk-KF0WldpjmOa10dEGhdcxs0h4Gqr-q_0Z9i_1_EwV5xuCH2tsXhXnG0XxztFR9viWer_34HAAD__0Dh_b0=
 
 subtest enum_name_clash
 
@@ -1527,5 +1527,3 @@ ALTER DATABASE db_enum_name_clash SET PRIMARY REGION "us-east-1"
 statement ok
 DROP TYPE db_enum_name_clash.crdb_internal_region;
 ALTER DATABASE db_enum_name_clash SET PRIMARY REGION "us-east-1"
-
-

pkg/ccl/logictestccl/testdata/logic_test/regional_by_row

@@ -689,7 +689,7 @@ SELECT message FROM [SHOW KV TRACE FOR SESSION] WITH ORDINALITY
  OR message LIKE 'Scan%'
  ORDER BY ordinality ASC
 ----
-Scan /Table/73/1/"@"/1{-/#}, /Table/73/1/"\x80"/1{-/#}, /Table/73/1/"\xc0"/1{-/#}
+Scan /Table/73/1/"@"/1/0, /Table/73/1/"\x80"/1/0, /Table/73/1/"\xc0"/1/0
 fetched: /regional_by_row_table/primary/'ap-southeast-2'/1/pk2/a/b/j -> /1/2/3/'{"a": "b"}'
 output row: [1 1 2 3 '{"a": "b"}']
 
@@ -716,7 +716,7 @@ vectorized: true
       table: regional_by_row_table@primary
       spans: [/'ca-central-1'/1 - /'ca-central-1'/1] [/'us-east-1'/1 - /'us-east-1'/1]
 ·
-Diagram: https://cockroachdb.github.io/distsqlplan/decode.html#eJykkVEL0zAQx9_9FOF8Uclo0ylIQIhoxULdZjtQsGVkzTGLXVKTFDdGv7usRbbJJmw-3l3-l98vOYD72QCH-OsifZvMyLP3Sb7MP6fPSR6n8bsleUE-ZPNPxOKmNlo2q_V-Zc2vlZfrBsmXj3EWk_YHeUMYUNBG4Uxu0QH_BgxKCq01FTpn7LF1GA4kagc8pFDrtvPHdkmhMhaBH8DXvkHgsDxuz1AqtEEIFBR6WTfD2qsgorX1Vto9UMhbqR0nQQFFsXsdFhCwyXkRPCVSK8KI8d_RAoV55zkRjIqIiikVL6l4BWVPwXT-BOi83CBw1tPHJNijEuKPgBjh7wSObgKfODttrEKL6oKx7K8ozczEtEF0KZPW29oTdpMhvOfRMnSt0Q7_Yrm1uaSAaoOjkDOdrXBhTTVcM5bzITc0FDo_TqOxSPQwGn71PMz-Jxz9Mzy9CId92T_5HQAA__-b4SGh
+Diagram: https://cockroachdb.github.io/distsqlplan/decode.html#eJykkVFr2zAUhd_3K8R92oaGLWeDIRh4bC41uElqB1qoTVCsS2rqSK4k04Tg_15iP6QpSSHp4z1X5-g70hbscw0covtp8jcek6__42yW3SbfSBYl0b8Z-U6u0skNMbistBL1fLGZG_0yd2JRI7m7jtKINE_kD2FAQWmJY7FCC_wBGBQUGqNLtFabnbTtD8RyDdynUKmmdTu5oFBqg8C34CpXI3CY7dJTFBKN5wMFiU5UdR97FCRsTLUSZgMUskYoy4mXQ56vf_s5eMzziVCSMKLdIxqgMGkdJyGjYUDDEQ1_0vAXFB0F3bo9k3ViicBZRy_jZpdyhwPzmZzBSc49Xqu0kWhQHqAV3ZEmY_1DN15w2CGpVpUj7CSDf85bpWgbrSy-YzmVXFBAucShkNWtKXFqdNlfM4yT3tcLEq0btsEwxKpf9Z_51sw-Yw4-NI8OzH5XdF9eAwAA__86rhxz
 
 statement ok
 SET tracing = on,kv,results; SELECT * FROM regional_by_row_table WHERE pk = 1; SET tracing = off
@@ -728,7 +728,7 @@ SELECT message FROM [SHOW KV TRACE FOR SESSION] WITH ORDINALITY
  OR message LIKE 'Scan%'
  ORDER BY ordinality ASC
 ----
-Scan /Table/73/1/"@"/1{-/#}
+Scan /Table/73/1/"@"/1/0
 fetched: /regional_by_row_table/primary/'ap-southeast-2'/1/pk2/a/b/j -> /1/2/3/'{"a": "b"}'
 output row: [1 1 2 3 '{"a": "b"}']
 
@@ -743,8 +743,8 @@ SELECT message FROM [SHOW KV TRACE FOR SESSION] WITH ORDINALITY
  OR message LIKE 'Scan%'
  ORDER BY ordinality ASC
 ----
-Scan /Table/73/1/"@"/10{-/#}
-Scan /Table/73/1/"\x80"/10{-/#}, /Table/73/1/"\xc0"/10{-/#}
+Scan /Table/73/1/"@"/10/0
+Scan /Table/73/1/"\x80"/10/0, /Table/73/1/"\xc0"/10/0
 fetched: /regional_by_row_table/primary/'ca-central-1'/10/pk2/a/b -> /10/11/12
 output row: [10 10 11 12 NULL]
 
@@ -824,9 +824,9 @@ SELECT message FROM [SHOW KV TRACE FOR SESSION] WITH ORDINALITY
  OR message LIKE 'Scan%'
  ORDER BY ordinality ASC
 ----
-Scan /Table/75/1/"@"/10{-/#}, /Table/75/1/"\x80"/10{-/#}, /Table/75/1/"\xc0"/10{-/#}
+Scan /Table/75/1/"@"/10/0{-/NULL}, /Table/75/1/"\x80"/10/0{-/NULL}, /Table/75/1/"\xc0"/10/0{-/NULL}
 fetched: /child/primary/'ap-southeast-2'/10/c_p_id -> /10
-Scan /Table/74/1/"@"/10{-/#}, /Table/74/1/"\x80"/10{-/#}, /Table/74/1/"\xc0"/10{-/#}
+Scan /Table/74/1/"@"/10/0, /Table/74/1/"\x80"/10/0, /Table/74/1/"\xc0"/10/0
 fetched: /parent/primary/'ap-southeast-2'/10 -> NULL
 
 statement ok
@@ -862,7 +862,7 @@ vectorized: true
               table: child@primary
               spans: [/'ca-central-1'/10 - /'ca-central-1'/10] [/'us-east-1'/10 - /'us-east-1'/10]
 ·
-Diagram: https://cockroachdb.github.io/distsqlplan/decode.html#eJy0k1Fr2zAQx9_3KY7bQ5KhEtlxoQgKLqvLXDynSwwrLKZ41tF6SyRPliEl5LuP2GGNwxLSjr35Tve3fv_T3QqrX3MUGNzfRVdhDP3rcJpMv0QDmAZR8DGBD3AzGX-G_KmYS_j6KZgE0I_HCQT3m0Lod8vKzJCy27ryoZBwCfnD5mMwgKv4Gvp5m3T4ABkqLSnOFlSh-IYOpgxLo3OqKm02qVVTEMolCs6wUGVtN-mUYa4NoVihLeycUGCSfZ_ThDJJZsiRoSSbFfPmtw25X5pikZlnZDgtM1UJGM5wNlte8BkOHX7WiYbvIVMSHND2iQwyHNdWgO8w38V0zVDX9oWkstkjoXDW7G20zqm0_h9Sf0t5Gpl7kOwFqFbaSDIkOzDp-i_ssT7T5dDtUkfForDgHGTgr-nOrS7Utjmj7jXJc0kCouAmgas4CeF2HMbIsB26naZFWv-sS_ihCwVaCej7I7gE392OoO_BJSx7Hu8JIXyHc37uDU5r5uiNRrz_ZWSzssvexa4VBste3vF2ojnvNeYmVJVaVbQ3MYfeP2VI8pHasat0bXK6MzpvrmnDcaNrEpIq2566bRCq5qhZsl2x8y9i96h41BHzffHoqNg7LvaOis_3xOn63e8AAAD__2Pcwcc=
+Diagram: https://cockroachdb.github.io/distsqlplan/decode.html#eJy0k2Fr2zwQx98_n-K4N0keNCI7LhRBwGF1mYvndIlhhcUUzzpab4nkyTKkhHz3ETvQOCwh7dg763R_3-9_uttg9WuJAoOH-2gSxtC_CefJ_Es0gHkQBR8T-B9uZ9PPkD8XSwlfPwWzAPrxNIHgYZcI_W5amRlSdp9XPhYSxpA_7j4GA5jEN9DP26DDB8hQaUlxtqIKxTd0MGVYGp1TVWmzC22ahFCuUXCGhSpruwunDHNtCMUGbWGXhAKT7PuSZpRJMkOODCXZrFg2v23I_dIUq8y8IMN5malKwHCBi8X6mi9w6PAhh0xJcEDbZzLIcFpbAb7DfBfTLUNd29falc2eCIWzZe_jcy7l8_dsl_G4J3leMWqljSRDsoOQbv9AHOsPuhy6XdaoWBUWnJMM_C09udOF2rdk1C2TvJQkIApuE5jESQh30zBGhu1wHbQq0vpnXcIPXSjQSkDfH8EYfHc_ar4HY1j3PN4TQvgO5_zKG1zWzNE7jXj_yshuNde960MrDNa9vOPtQnPeW8zNqCq1quhoYk69f8qQ5BO1Y1fp2uR0b3TelGmP00bXBCRVtr1120OomqtmtQ7Fzt-I3bPiUUfMj8Wjs2LvvNg7K746Eqfb_34HAAD__-igvDk=
 
 statement ok
 SET tracing = on,kv,results; SELECT * FROM child WHERE NOT EXISTS (SELECT * FROM parent WHERE p_id = c_p_id) AND c_id = 10; SET tracing = off
@@ -874,9 +874,9 @@ SELECT message FROM [SHOW KV TRACE FOR SESSION] WITH ORDINALITY
  OR message LIKE 'Scan%'
  ORDER BY ordinality ASC
 ----
-Scan /Table/75/1/"@"/10{-/#}
+Scan /Table/75/1/"@"/10/0
 fetched: /child/primary/'ap-southeast-2'/10/c_p_id -> /10
-Scan /Table/74/1/"@"/10{-/#}
+Scan /Table/74/1/"@"/10/0
 fetched: /parent/primary/'ap-southeast-2'/10 -> NULL
 
 statement ok
@@ -890,11 +890,11 @@ SELECT message FROM [SHOW KV TRACE FOR SESSION] WITH ORDINALITY
  OR message LIKE 'Scan%'
  ORDER BY ordinality ASC
 ----
-Scan /Table/75/1/"@"/20{-/#}
-Scan /Table/75/1/"\x80"/20{-/#}, /Table/75/1/"\xc0"/20{-/#}
+Scan /Table/75/1/"@"/20/0
+Scan /Table/75/1/"\x80"/20/0, /Table/75/1/"\xc0"/20/0
 fetched: /child/primary/'ca-central-1'/20/c_p_id -> /20
-Scan /Table/74/1/"@"/20{-/#}
-Scan /Table/74/1/"\x80"/20{-/#}, /Table/74/1/"\xc0"/20{-/#}
+Scan /Table/74/1/"@"/20/0
+Scan /Table/74/1/"\x80"/20/0, /Table/74/1/"\xc0"/20/0
 fetched: /parent/primary/'ca-central-1'/20 -> NULL
 
 query T

pkg/kv/kvclient/kvcoord/dist_sender.go

@@ -613,7 +613,7 @@ func (ds *DistSender) initAndVerifyBatch(
 			case *roachpb.ReverseScanRequest:
 				// Accepted reverse range requests.
 
-			case *roachpb.QueryIntentRequest, *roachpb.EndTxnRequest:
+			case *roachpb.QueryIntentRequest, *roachpb.EndTxnRequest, *roachpb.GetRequest:
 				// Accepted point requests that can be in batches with limit.
 
 			default:

pkg/kv/kvserver/batcheval/BUILD.bazel

@@ -89,6 +89,7 @@ go_test(
         "cmd_add_sstable_test.go",
         "cmd_clear_range_test.go",
         "cmd_end_transaction_test.go",
+        "cmd_get_test.go",
         "cmd_lease_test.go",
         "cmd_recover_txn_test.go",
         "cmd_refresh_range_test.go",

pkg/kv/kvserver/batcheval/cmd_get.go

@@ -32,7 +32,22 @@ func Get(
 	h := cArgs.Header
 	reply := resp.(*roachpb.GetResponse)
 
-	val, intent, err := storage.MVCCGet(ctx, reader, args.Key, h.Timestamp, storage.MVCCGetOptions{
+	if h.MaxSpanRequestKeys < 0 || h.TargetBytes < 0 {
+		// Receipt of a GetRequest with negative MaxSpanRequestKeys or TargetBytes
+		// indicates that the request was part of a batch that has already exhausted
+		// its limit, which means that we should *not* serve the request and return
+		// a ResumeSpan for this GetRequest.
+		//
+		// This mirrors the logic in MVCCScan, though the logic in MVCCScan is
+		// slightly lower in the stack.
+		reply.ResumeSpan = &roachpb.Span{Key: args.Key}
+		reply.ResumeReason = roachpb.RESUME_KEY_LIMIT
+		return result.Result{}, nil
+	}
+	var val *roachpb.Value
+	var intent *roachpb.Intent
+	var err error
+	val, intent, err = storage.MVCCGet(ctx, reader, args.Key, h.Timestamp, storage.MVCCGetOptions{
 		Inconsistent:          h.ReadConsistency != roachpb.CONSISTENT,
 		Txn:                   h.Txn,
 		FailOnMoreRecent:      args.KeyLocking != lock.None,
@@ -41,6 +56,10 @@ func Get(
 	if err != nil {
 		return result.Result{}, err
 	}
+	if val != nil {
+		reply.NumKeys = 1
+		reply.NumBytes = int64(len(val.RawBytes))
+	}
 	var intents []roachpb.Intent
 	if intent != nil {
 		intents = append(intents, *intent)

pkg/kv/kvserver/batcheval/cmd_get_test.go

@@ -0,0 +1,96 @@
+// Copyright 2021 The Cockroach Authors.
+//
+// Use of this software is governed by the Business Source License
+// included in the file licenses/BSL.txt.
+//
+// As of the Change Date specified in that file, in accordance with
+// the Business Source License, use of this software will be governed
+// by the Apache License, Version 2.0, included in the file
+// licenses/APL.txt.
+
+package batcheval
+
+import (
+	"context"
+	"testing"
+
+	"github.com/cockroachdb/cockroach/pkg/roachpb"
+	"github.com/cockroachdb/cockroach/pkg/storage"
+	"github.com/cockroachdb/cockroach/pkg/util/leaktest"
+	"github.com/stretchr/testify/assert"
+)
+
+// TestGetResumeSpan tests that a GetRequest with a target bytes or max span
+// request keys is properly handled by returning no result with a resume span.
+func TestGetResumeSpan(t *testing.T) {
+	defer leaktest.AfterTest(t)()
+	ctx := context.Background()
+	resp := &roachpb.GetResponse{}
+	key := roachpb.Key([]byte{'a'})
+	value := roachpb.MakeValueFromString("woohoo")
+
+	db := storage.NewDefaultInMemForTesting()
+	defer db.Close()
+
+	_, err := Put(ctx, db, CommandArgs{
+		Header: roachpb.Header{TargetBytes: -1},
+		Args: &roachpb.PutRequest{
+			RequestHeader: roachpb.RequestHeader{
+				Key: key,
+			},
+			Value: value,
+		},
+	}, resp)
+	assert.NoError(t, err)
+
+	// Case 1: Check that a negative TargetBytes causes a resume span.
+	_, err = Get(ctx, db, CommandArgs{
+		Header: roachpb.Header{TargetBytes: -1},
+		Args: &roachpb.GetRequest{
+			RequestHeader: roachpb.RequestHeader{
+				Key: key,
+			},
+		},
+	}, resp)
+	assert.NoError(t, err)
+
+	assert.NotNil(t, resp.ResumeSpan)
+	assert.Equal(t, key, resp.ResumeSpan.Key)
+	assert.Nil(t, resp.ResumeSpan.EndKey)
+	assert.Nil(t, resp.Value)
+
+	resp = &roachpb.GetResponse{}
+	// Case 2: Check that a negative MaxSpanRequestKeys causes a resume span.
+	_, err = Get(ctx, db, CommandArgs{
+		Header: roachpb.Header{MaxSpanRequestKeys: -1},
+		Args: &roachpb.GetRequest{
+			RequestHeader: roachpb.RequestHeader{
+				Key: key,
+			},
+		},
+	}, resp)
+	assert.NoError(t, err)
+
+	assert.NotNil(t, resp.ResumeSpan)
+	assert.Equal(t, key, resp.ResumeSpan.Key)
+	assert.Nil(t, resp.ResumeSpan.EndKey)
+	assert.Nil(t, resp.Value)
+
+	resp = &roachpb.GetResponse{}
+	// Case 3: Check that a positive limit causes a normal return.
+	_, err = Get(ctx, db, CommandArgs{
+		Header: roachpb.Header{MaxSpanRequestKeys: 10, TargetBytes: 100},
+		Args: &roachpb.GetRequest{
+			RequestHeader: roachpb.RequestHeader{
+				Key: key,
+			},
+		},
+	}, resp)
+	assert.NoError(t, err)
+
+	assert.Nil(t, resp.ResumeSpan)
+	assert.NotNil(t, resp.Value)
+	assert.Equal(t, resp.Value.RawBytes, value.RawBytes)
+	assert.Equal(t, 1, int(resp.NumKeys))
+	assert.Equal(t, len(resp.Value.RawBytes), int(resp.NumBytes))
+}